Safety-lock for elevators



No. stems. Pmmea ian. i7, 8%. R. BUTTEBWGRTH. I

SAFETY LOCK FUR ELEVATGRS.

(Application filed Sept. 10, 1898.)

(No Model.)

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y UNITED STATES.

PATENT OFFICE.

ROBERT BUTTERWORTH, OF SOMERVILLE, MASSAGE USETTS.

SAFETY-LOCK FOR ELEVATO R's.

SPEGIFIGATIQN forming part of Letters Patent N 0. 618,025, dated January 17, 1 899 V x Application filed September 10,1898. Serial No. 690,646. (No model.)

I To all whom it may concern:

Be it known that 1, ROBERT BUTTERWQRTH, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Safety- Locks for Elevators, of which the following is a specification.

In the more common elevator practice the starting and stopping of the car are controlled by means of a. shipper -rope running over sheaves at the top and bottom of the elevatorwell. Generally from one of these sheaves the valves or belt-shippers are worked for starting or stopping the mechanism for driving the elevator.

As generally installed there is no means of securing this controlling-rope against the manipulations of persons at floors dilferent from that at which the elevator-car happens to be stationed; also, there is no means of securing a locked position at any desired point in the elevator-well, whether at landings or at a position between landings. These positions between landings are determined by the different heights of trucks or'wagons which unload from or load onto the elevator. My invention is directed to securely lock the elevator-car at any position in the elevator-well, and this locking may be done by any person at any position in'the well, whether on the carer at one of the landings. The mechanism which I have devised is adapted to do this.

. .The following description is sufiiciently full, clear, and exact to enable any person skilled in the art or science-t0 which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation. Fig. 2 is a side elevation, with elevator-guide partly broken away, of an elevator-well provided with my invention.

Like letters of reference indicate corresponding parts in both figures of the drawings.

A A represents the elevator-well B, the elevator-car, considered as a whole. The car is v of the ordinary form of freight-elevatorand tances loops or thimbles P, which when the elevatorcar is at rest at any height in the well may be slipped ov'er projecting pins or hooks S. By so doing the controlling-"rope is fixed, or at least what little slack there is in 6 5 the controlling-rope will not be enough to allow the elevator-car to start; The object in using the auxiliary rope L L forthe position of the loops or thimbles instead of putting them in the controlling-rope itself is due to the controlling-rope being generally tight. on the sheaves, thus not allowing sufiicient looseness-to slip the loop overqthe projecting hook. These loops or thimbles should be provided in-the auxiliary rope for all such I positions in the well that it is probable that a person will desire to do the act of locking.

It is seen thatno matter at what height the elevator-car is or upon'what position the person is who wishes to do the looking, as long as there is a loop or thimble and its accompanying hook in the reach of that person the elevator-car can belockedat this position and by this person.

Having explained my invention, what I 8 claim is- In an elevator locking device, the combination, with a series of pins or hooks, one at each floor, of a controlling-rope, and a series of loops or thimbles connected with the con- 0 trolling-rope and adapted to be engaged by said pins or hooks, substantially as described; In testimony whereof I have aifixed my sig nature in presence of two witnesses.

. ROBERT BUTTERWORTH.

Witnesses:

WALDO I. GETCHELL,

ELWELL R. BUTTERWORTH. 

